Spectrum Modification for Full Scale Fatigue Testing of an Ageing Aircraft

Manjunatha, CM and Ranganath, VR (2006) Spectrum Modification for Full Scale Fatigue Testing of an Ageing Aircraft. In: Proceedings of 14th National Seminar on Aerospace Structures: Fatigue, Fracture and Ageing Structures, 30-31 Jan 2006, Nagpur, India.

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    Abstract

    The flight load sequence of a combat aircraft was modified by eliminating different levels of small amplitude load excursions to derive several different test load sequences. The fatigue crack growth behavior under all these spectrum load sequence was predicted in a single edge notched tension specimen of an airframe grade La16 aluminum alloy. Crack growth behavior was predicted using a fatigue crack growth law derived from the constant amplitude fatigue crack growth tests, incorporating crack closure effects. It was observed that full scale fatigue testing time can be reduced significantly by using of one of the derived test load spectrum without compromising, in general, on the fatigue damage caused by eliminated load cycles.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Fatigue crack growth;Spectrum Loading;Aircraft;Aluminum alloy
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Structural Integrity Division, Structural Integrity Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 23 Nov 2010 13:59
    Last Modified: 23 Nov 2010 13:59
    URI: http://nal-ir.nal.res.in/id/eprint/9101

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